ISO 31-3

In this article we will explore the fascinating world of ISO 31-3, a topic that has captured the attention of people of all ages and interests. Known for its impact on society and culture, ISO 31-3 has been the subject of debate and analysis in numerous areas. From its emergence to the present, ISO 31-3 has left a significant mark on history, and its influence continues to be palpable in the contemporary world. Through this article, we will delve into the most relevant aspects of ISO 31-3, analyzing its importance, its implications and its projection into the future. Prepare your minds for a journey of discovery and introspection in the wonderful universe of ISO 31-3.

Standard for names and symbols

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ISO 31-3 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to mechanics. It was published on 27 August 1992 and withdrawn on 17 March 2006 due to being superseded by ISO 80000-4.^[1]

Its definitions include (note boldfaced symbols mean quantity is a vector):

Quantity		Unit			Remarks
Name	Symbol	Name	Symbol	Definition
Force	F	newton	N	1 N = 1 kg·m/s2	Unit named after Isaac Newton
Moment of force, Torque	M, ${\displaystyle {\boldsymbol {\tau }}}$		N·m	1 N·m = 1 kg·m2/s2	The unit is dimensionally equivalent to the units of energy, the joule; but the joule should not be used as an alternative for the newton metre.
Linear momentum	p		kg·m/s or N·s
(Linear) impulse	J		N·s or kg·m/s
Angular momentum	L		kg·m2/s or N·m·s
Mechanical energy, Work	E, W	joule	J	1 J = 1 kg·m2/s2 = 1 Pa·m3 = 1 W·s	Unit named after James Joule. The joule is dimensionally equivalent to the units of torque and moment of force but should be used in preference to the newton metre (N·m).
Power	P	watt	W	1 W = 1 J/s = 1 N·m/s = 1 kg·m2/s3	Unit named after James Watt.
Pressure	p	pascal	Pa	1 Pa = 1 N / m2 = 1 kg/(m·s2)	Named after Blaise Pascal.
Normal stress, Shear stress	${\displaystyle \sigma ,\tau }$	pascal	Pa	1 Pa = 1 N / m2 = 1 kg/(m·s2)	Named after Blaise Pascal.
...

References

1. ^ "ISO 31-3:1992". ISO. Retrieved 2025-01-25.

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